Machine for threading pipe-nipples



2 Sheets-Sheet 1.

(No Model.)

H. O. WALTER MACHINE FOR THREADING PIPE NIPPLES.

Patented Nov 19, 1889.

5 m. Wanhingtoll. u. c.

(No Model.) 2 sheets -sheet 2.

H. O. WALTER MACHINE FOR THREADING PIPE NIPPLES.

N0.'415,592. Patented Nov. 19, 1889.

N. FEYERS. Phoivljlhognphcr, Washingion, D4 C.

UNITED STATES PATENT QFFICE.

HENRY VAT/PER, OF BRIDGEPORT, CONNECTICUT.

MACHINE FOR THREADING PIPE-NIPPLES.

SPECIFICATION forming part of Letters Patent No. 415,592, dated November19, 1889.

Application filed January 2, 1389. Serial No. 295,113. (No model.)

State of Connecticut, have invented certain new and useful Improvementsin Machines for Threading Pipe-Nipples; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

My invention relates to certain new and useful improvements in machinesfor cutting threads on nipples, and has for its object to render the,operation of cutting said threads automatic, and, furthermore, toaccomplish the threading of the two ends of a nipple in the same timethat has heretofore been consumed in threading one end.

WVith these ends in view my invention consists in certain details ofconstruction and novel organization of mechanisms and in thecombinations of devices, which will hereinafter first be described, andthen specifically be designated by the claims.

The accompanying drawings represent with sufficient fullness thoseportions or features which it is deemed necessary to show of a suitableorganization of mechanism for carrying out my invention, such as willenable those skilled in the art to which my invention appertains to havea full, clear, and exact understanding of the same.-

There are some changes which may be made without departing from thespirit of my invention and which will be mentioned hereinafter, whileothers more obvious would be suggested to a skillful workman, or oneskilled in the art to which my invention appertains, simply by readingthis specification and examining the drawings, in which- Figure 1 is afront elevation of a machine embodying my invention; Fig. 2, a sectionat the line a: of Fig. 1; Fig. 3, a detail section at the line y y ofFig. 2, a section of pipe being shown within the thread-cutters; andFig. 4, a detail cross-section of the clutch mechanism.

Similar letters denote like parts in the several figures.

A is the bed of the machine, and B B C O are j ournal-boxes.

tion.

on the inner end of this spindle F. Both of these chucks are of ordinaryconstruction as far as the arrangement and operation of their cutters 1.are concerned, and I therefore will not enter-into any description ofsaid chucks, as they form no part of my present inven- The only featuresof this old and wellknown chuck which are to be borne in mind are thatthe thread-cutters 1 are operated by turning the ring 2, and this iseffected by manipulating the usual handles G is a gear-wheel having ahub ll, through which extends the spindle D. This hub is journaledwithin the box B, and is rigidly secured to the spindle D by a set-screw4.

I is also a gear-wheel, having a hub J, through which the spindle Fextends. The spindle F and hub J have no connection whatever with eachother, and are perfectly free to revolve independently, and, moreover,said spindle has a free lengthwise movement within the hub J, whichlatter is journaled within the box 0. The inner end of the hub J isformed with a shoulder 5, which is adapted to engage with a shoulder 6,extending from a collar K, rigidly mounted on the spindle F. This collarhas a circumferential groove 7, and a stud 8 projects from an ordinaryhandlever L within said groove. The lever L is pivoted to an upright M,and is operated to throw the collar within and out of engagement withthe hub J, and also to project or withdraw the chuck E, for the purposepresently explained.

' The wheels G I are geared, respectively, with wheels N O, which latterare mounted on shafts P Q, revolving in opposite directions, so that itwill be readily understood that when the clutch 5 6 is engaged thechucks E E will revolve in opposite directions. Now, when a pipe-sectionis placed with its ends within the respective chucks and the lever Lmanipulated to clamp said section firmly between the chucks, the cutterswithin the latter will immediately commence to thread the two ends ofthe pipe. Now, as the tendency of this threading is to draw the chuckstogether, and as the spindle F has alengthwise movement, it follows thatthe chuck E will be drawn toward the chuck E.

In order that the desired depth of thread may be uniformly cut, Iprovide a stop R, which is secured at the bottom of the chucks by screws9, the end aimed at in this connection being that when the pipeshallhave been threaded to the required depth the extremities of saidpipe will abut against said stops simultaneously with the disengagem entof the clutch-shoulders 5 6. Of course, if it were possible for theinitial cut of the two threads to be synchronous, and if both chucksrevolved at exactly the same rate of speed, so

that the cutting of both threads was begun and ended-at precisely thesame moment of time, then the stops would be superfluous; but, as amatter of fact, the initial cutting of the two threads isgenerallysequential, and one end of the pipe usually abuts against itsstop before the threading of the other end is completed, so as to causea similar abutment. This is easily accounted for, because only by themerest accident can the resistance offered by the two chucks to thepreliminary clamping of the pipe be exactly equal, and very rarely willthe ends of said pipe center at precisely the same moment of time withinthe operative field of the cutters, and for the further reason that itis well-nigh impossible that there could be an exact equality betweenthe size of the driving-pulleys, the lost motion of the gearings, thewear on the bearings, and the friction of the belts.

It will be clearly seen that the length of the line of engagementbetween the shoulders 5 6 must be equal to the combined depths of thethreads which are to be cut.

The provision of the stop R enables threads of different depths to becut at the respective ends of the pipe, it only being necessary in thisconnection to use stops which are farther in the rear of the cutters, orvice versa, as the case may demand.

WVhen both ends of the nipple are threaded and the shoulders 5 6disengaged, the chuck E will be reversed as to its revolution, ow-

ing to the rigid connection thus established between the two chucksthrough the mediumof the threaded pipe, and the operator then shuts offthe power from the machine, spreads the cutters, backs the spindle F,and removes the threaded nipple.

From the foregoing description it will be obvious that the relativespeeds of the two chucks have nothing whatever to do with tion, since,as I have above fully explained,

the provision of the stops renders it immaterial whether or not the endsof the nipple are threaded one in advance of the other,

and for this reason the chuck E may be stationary on a fixed spindle;but I prefer the construction shown and described, since it contemplatesthe rapid threading of the nipple; and, moreover, if one stationarychuck were used, the speed of the other chuck would have to be doubled,in order to accomplish the result effected by the two revolving chucks.

Having thus described my invention, whatI claim as new, and desire tosecure by Letters Patent, is

1. The combination of the chucks mounted one upon a spindle stationaryas to lengthwise movement, and the other upon a loose spindle having alengthwise movement, the shouldered collar rigid with the loose spindle,the shouldered hub rigid with the powertransmitting wheel and having apredetermined line of engagement with said collar during the lengthwisemovement of the loose spindle, and the stops secured within the chucksand operating to check said lengthwise movement at the moment of thedisengagement of said hub and collar, substan tially as set forth.

2. The combination of the spindle D, rigidly secured to the hub H, thehub J, having a shoulder 5, the spindle F, extending loosely throughsaid shouldered hub, the collar K, rigid on the spindle F and. having ashoulder 6, adapted to engage with the shoulder 5, the circumferentialgroove 7 within said collar, the pivoted hand-lever L, having a stud 8extended within said groove, the chucks mounted 011 the inner ends ofsaid spindles, and the stops R, secured within said chucks,substantially as and for the purposes hereinbefore set forth.

3. In a machine for automatically threading the two ends of nipples, twothread-cutting chucks revolving in opposite directions and provided eachwith detachable stops which limit the depth of threads, in combinationwith means for predetermining the effective action of said chucks,substantially as set forth.

4:. In a machine for automatically threading the two ends of nipples,two thread-cutting chucks mounted on opposite revoluble spindles, one ofwhichlatter has-alengtln'visc movement and an engagement with theinotive power predetermined by the combined depths of threads cut 011said ends, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.the successful carrying out of my inven- HENRY C. WALTER. lVitn esses:

S. S. WILLIAMSON, J. J. DEVITT.

ICC

